General Studies · Mathematical Operations
यदि '+' और '−' को आपस में बदल दिया जाए और '×' तथा '÷' को आपस में बदल दिया जाए, तो निम्नलिखित समीकरण में प्रश्न चिह्न (?) के स्थान पर क्या आएगा? 63 × 7 ÷ 5 − 39 + 21 = ?
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